Dual valved vacuum breaker



March 17, 1964 J. D. LANGDoN 3,125,114

DUAL VALVED VACUUM BREAKER Filed Aug. l5, 1960 INVENTOR United States Patent O 3,125,114 DUAL VALVED VACUUM BREAKER Jesse D. Langdon, 1 John St., East Rockaway, NY. Filed Aug. 15, 1960, Ser. No. 49,549 7 Claims. (Cl. 137-218) The instant invention pertains to devices for prevention of back-Siphonage or backflow of contaminated fluid from a container into a supply line.

The following list of patents issued to instant applicant all contain continuing disclosure bridged by still pending application Ser. No. 560,841 tiled Oct. 28, 1944, now abandoned showing and describing a valve unit comprising a casing having inlet and outlet ends, vent means thru the casing wall between the two ends, a sleeve valve of deformable Vmaterial inserted into the inlet end of said casing and having an imperforate wall portion overlying the inside of said vent means, the sleeve being held in operative position by rigid means secured inside of and supporting said sleeve against the inlet end of said casing, the end of the sleeve that is toward said outlet forming a check valve closed by a diaphragm provided with a slit passage bordered by flexible lip means adapted to close the outlet end of said sleeve against ingress of pressure fluid into said sleeve from toward the outlet end:

The primary objects and purposes of this invention are to provide `a hollow casing having inlet and outlet ends with vent means communicating through the casing wall between the two ends, said inlet end adapted for sealed connection with a source of iluid pressure supply, wherein valve means is extended across the inside of and adapted to close said vent means under effect of internal pressure, Ia second check valve means secured within, extended across the hollow of said casing between the vent means and the outlet end and adapted to open under the eifect of internal pressure, emanating from the inlet end, passage means provided between said vent means and communicating with said inlet above said check valve, whereby negative pressure existing within said casing permits external pressure effective via said vent means against said valve means to enter said casing, said check valve disposed across the hollow being closed under the elect of external pressure, thereby preventing backflow of pressure -iluid from the outlet end of said casing, at the same time permitting the ingress of air through said vent means.

Another object is to provide a device of the character described comprising a sleeve valve member made of deformable material capable of returning to shape after being deformed and having an inlet end juxtapositioned and secured within the inlet end of a hollow casing provided with an outlet end, vent means through the casing wall between said inlet and outlet ends, the wall of said sleeve member extended to overlay said vent means, check valve means secured inside of and interrupting between the casing outlet and that part of the sleeve valve that overlies said vent means, passage means above said check valve and the overlying portion of the sleeve to provide communication between'said vents and said inlet end of said casing, said check valve being closed against the ingress of pressure fluid from said outlet, whereby when Patented Mar. 17 1964 a negative pressure exists in said inlet end atmospheric pressure will collapse said sleeve valve and ow toward said inlet and said check valve will prevent the ingress of pressure lluid from said outlet end.

Other and further objects and purposes will appear during progress of the specification as illustrated by the tigures of the drawings which illustrate three specie forms of the invention. The reductions to practice shown are used for purpose of illustration only, and it is specifically understood may be changed within scope of the claims.

Of the drawings:

FIG. 1 is a vertical median section of one species using a perforated tubular flanged cage to suspend the valve elements in operative position. Y

FIG. 2 is a vertical median section wherein a flanged barred cage is used to retain the valve elements in operative position.

FIG. 3 is a transverse sectional view taken at 3-3 of FIG. 2 looking up and also substantially illustrates in cross section the species shown by FIGS. 1, 2 and 4.

FIG. 4 is a vertical median sectional view of another -form of the invention.

Like characters used throughout the drawings to illustrat-e 'equivalent parts of the several figures of the drawings. Letter characters added to the numerals indicating variations in form.

FIG. 1 shows sleeve valve means 1 made of deformable material having a conduit passage 1C and provided with `an inlet end 2 concomitant a casing inlet and having a ilange 1F. The lower end of the sleeve valve means 1 being formed by a baffle means 3 provided with transverse lips L bordering a slit opening forming an outlet passage for sleeve valve means 1 provided with perforations lP-IP forming air inlet means thru the wall of sleeve valve means 1. The upper portion of sleeve valve means 1 above ports 1P-1P is provided with an imerforate wall portion 4. The sleeve valve means 1 is provided with an annular skirt 1S extended radially outward surrounding the baffled end of sleeve valve means 1 and impinging the inside of a surrounding casing portion 8. A tubular cage-like member 5 having its upper end provided with and depending from a flange extended radially outward and forming a ring 5R recessed into ange 1F of sleeve valve means '1. The cage-like member 5 is tubular in form and provided with perforations 05 near its upper end below flange 1F to permit internal pressure to be projected against the imperforate wall portion 4 of sleeve valve means 1 overlying vent means V-V through the Wall 8 of casing 6 made in two parts, including a coupling nut portion 7 concomitant a depending wall portion 8 flanged adjacent inlet end 2 of sleeve valve means 1, the llange 1F thereof normally resting on a corresponding annular shoulder provided by the inlet end 2 formed by nut 7 of casing `6. The skirt 1S surrounding the lower end of sleeve valve means 1 impinges the inside of wall portion 8 of casing 6 and nut 7 in conjunction with sleeve Valve means 1. The inside wall of the casing portion 8 together with baffle means 3 and lips L forms check valve means 10 disposed across the passage thru casing 6, prohibiting entry or backtlow of pressure fluid toward inlet 2 in the direction indicated by arrow. A passage means 11 is provided between vent means V-V and ports y'1P- 1P perforated thru the lower portion of sleeve valve means 1 above check valve 10 and below the imperforate wall portion 4 of sleeve valve means 1.

Ihe internally threaded inlet portion of any species using casing 6 Idepicted by the -gures of the drawings in conjunction with the nut portion 7 together with flange 1F of sleeve valve means 1 forms a pressure sealable joint for connection to a lfluid pressure supply line.

The full equivalent elements illustrated by several figures of the drawings are as follows:

FIG. 1 shows a sleeve valve means 1 and comprises a single valve unit including a' perforated tubular casing 5 combined to form one check valve adapted to close against imperforate portion 4 under internal pressure emanating from inlet 2 prohibiting the egress of iiuid under pressure through vent means V, at the same time, 'the egress of pressure Iiiuid occurs-via check valve lil.

On the other hand, when negative pressure exists at inlet 2,- fluid under pressure emanating from the outlet end of casing r8` is prohibited' from iiowing through the second check valve 10 in the direction indicated by arrow pointling toward inlet Z. Atmospheric pressure entering through vent means V-V is effective to collapse imperforate sleeve portion 4 and pass toward inlet 2 via pas- 'sage means- 1'1 and ports 5P5P below the imperforate portion 4 of sleeve valve means 1. FIG. 1 shows a full equivalent imperforate wall portion 4 effectively equal- 'ing 4A of ymember 1A of FIG. 2, or 4B of member 1B of FIG. 4. Perforated tubular cage 5 of FIG. l is the full equivalent of cage 9 of FIG. 2 formed with depending bars 5B, the apertures 5A-5A between bar means 5B of FIG. 2 being `the full equivalents of openings (i5-95 plus SP-SP of FIG. 1. The supporting ring 5R of rigid material juxtapositioned with iiange 1F of FIGS. `1, 2 and 4 serve the identical purpose of holding various elements of valve assembly in operative relationship. The ring 5R of FIG. v4 is supplemented by transverse bar means 5E forming an axial support from which a single rod 5S- depends suspending a perforated outlet frame or plate designated as 0 in all figures of the drawing and serves to hold in operative position and prevent the secondV check valve 10i, 10A or 10B from collapsing radially inward. As a matter of choice, any other suitable form of radial support-may be substituted in place of perforated plate 0 `depicted by FIG. 3.

Having described the invention and roperation thereof, the following claims are made:

1. A dual valved breaker comprising a tubular casing having inlet and outer ends with a passage therebetween, sleeve valve means of deformable material depending from the inlet end Ainto said passage toward the outlet end, said sleeve valve means provided with an imperforate wall portion overlying vent means perforated throughthecasing wall near said inlet end and forming iirst check valve means, second check valve means of deformable material extending across, secured within and normally closing the casing passage between said sleeve valve means and said outlet end, said second check Valve means including lip means having outer face portions disposed toward said outlet end, supporting means supportingA said sleeve in operative position and said second check valve means in spaced relation to said first check valve, said supporting means including a portion thereof for supporting said lip'means against reversal under pressure from said outlet end, passage means being provided between the iirst and second check valve means whereby when a negative pressure exists within said inlet end external pressure is effective to collapse said imperforate wall of said sleeve to permit external pressure enter and break any vacuum existing within the inlet end of said casing.

2. A device of the character defined by claim 1, wherein said support means is Aa rigid member with the portion thereof supporting said sleeve in operative position located inside the inlet end of said means forming the passage means, and lthe'periphery of said second check valvemeans impinging the inner wall of and closing the tubular passage of said casing.

3. A device of'the character described comprising an annular valve member in the form of a sleeve depending from the inlet end of and extended into the passage of a tubular casing having inlet and outlet ends, the valve member forming two check valve means as a single unit made of deformable material having an imperforate wall portion forming one check valve means overlying vent means perforated through the wall of and near the inlet end of the casing, that end of the deformable sleeve that is toward the outlet being-extended transversely across and closing the outlet end of the sleeve the same end thereof provided with an opening closed by flexible lip means exposed toward said outlet of said casing and forming second check valve means, said lip means arranged to close said opening under the effect of external pressure, port means provided through the wall of the sleeve below said vent means and above said second check valve means, and the same end being peripherally sealed against the inner wall of said casing to prohibit passage of pressure fluid around the periphery of said second check valve means.

4. A valve device of the character described comprising a tubular casing having inlet -and outlet ends and provided with vent means 'between the two ends, a sleeve made of deformable-material inserted into said inlet end and held in operative position by rigid means extended between opposite ends of said sleeve, a portion of the sleeve wall overlaying the inside of said vent means and forming one check valve means arranged to open under the effect of external pressure, the end of said sleeve that is toward the outlet end forming second check valve means arranged to close under -the effect of external pressure, port means forming passage means through the Wall of said sleeve below said vent'means and above said second check valve means permitting atmosphere to pass through the wall of said sleeve when a negative pressure exists within said inlet end.

5. A device of the character described comprising a casing having inlet and outlet ends,vent means through the casing wall between the two ends, a sleeve valve of deformable material inserted into the inlet end of said casing and having an irnperforate wall-portion forming check valve means overlaying the inside of said vent means, the sleeve being held in operative position by rigid means concomitant theinner side of and supporting said sleeve against the inlet end of said casing and holding said sleeve in operative position, -that end of said sleeve that is toward said outlet end forming a second check valve means closed by a diaphragm provided with slit means therethrough bordered by flexible lip means projecting toward said outlet end and adapted to close said slit passage against ingress of pressure uid into said sleeve from said outlet end, wherein port means is provided through the wall-of the deformable sleeve between the diaphragm and said imperforate wall-portion overlaying the inside of said vent means, sealing means being provided between said second valve means and said casing wall to prohibit'passage of pressure iiuid, whereby when negative pressure exists within said sleeve atmospheric pressure entering through said vent means will collapse the imperforate wall portion of said sleeve permitting air to enter the passage within the sleeve.

6. A device of the character defined by claim 5 wherein the diaphragm is separated and spaced away from the proximate end of the imperforate wall portion of the sleeve to provide port means communicating with the inside of said sleeve between the end of the sleeve and said diaphragm, the periphery of said diaphragm adapted to impinge the inside wall of the casing to prevent passage of iiuid between theperiphery of said diaphragm and the inside of said casing.

7. A device of the character dened by claim 5, wherein the rigid means is in the form of a cage flanged radially outward at one end concomitant a shoulder provided for the inlet end of the deformable sleeve, that end of said cage that is distal to its iianged end juxtadisposed with the diaphragm to prevent'said diaphrgam from being urged toward the sleeve under intluence of external pressure when a negative pressure exists within said sleeve.

(References on followingpage) References Cited in the file of this patent UNITED STATES PATENTS Langdon Jan. 16, 1940 Taggart Nov. 6, 1894 Groeniger Sept. 14, 1937 Langdon Jan. 30, 1942 Langdon Aug. 31, 1943 Burke May 8, 1944 

1. A DUAL VALVED BREAKER COMPRISING A TUBULAR CASING HAVING INLET AND OUTER ENDS WITH A PASSAGE THEREBETWEEN, SLEEVE VALVE MEANS OF DEFORMABLE MATERIAL DEPENDING FROM THE INLET END INTO SAID PASSAGE TOWARD THE OUTLET END, SAID SLEEVE VALVE MEANS PROVIDED WITH AN IMPERFORATE WALL PORTION OVERLYING VENT MEANS PERFORATED THROUGH THE CASING WALL NEAR SAID INLET END AND FORMING FIRST CHECK VALVE MEANS, SECOND CHECK VALVE MEANS OF DEFORMABLE MATERIAL EXTENDING ACROSS, SECURED WITHIN AND NORMALLY CLOSING THE CASING PASSAGE BETWEEN SAID SLEEVE VALVE MEANS AND SAID OUTLET END, SAID SECOND CHECK VALVE MEANS INCLUDING LIP MEANS HAVING OUTER FACE PORTIONS DISPOSED TOWARD SAID OUTLET END, SUPPORTING MEANS SUPPORTING SAID SLEEVE IN OPERATIVE POSITION AND SAID SECOND CHECK VALVE MEANS IN SPACED RELATION TO SAID FIRST CHECK VALVE, SAID SUPPORTING MEANS INCLUDING A PORTION THEREOF FOR SUPPORTING SAID LIP MEANS AGAINST REVERSAL UNDER PRESSURE FROM SAID OUTLET END, PASSAGE MEANS BEING PROVIDED BETWEEN THE FIRST AND SECOND CHECK VALVE MEANS WHEREBY WHEN A NEGATIVE PRESSURE EXISTS WITHIN SAID INLET END EXTERNAL PRESSURE IS EFFECTIVE TO COLLAPSE SAID IMPERFORATE WALL OF SAID SLEEVE TO PERMIT EXTERNAL PRESSURE ENTER AND BREAK ANY VACUUM EXISTING WITHIN THE INLET END OF SAID CASING. 